So I finally got some time to work on the car and the exhaust was first on my list. The goal with my exhaust setup was to retain the power and fuel economy increases seen after installing the header, but loose the terible noise made by the stock muffler. I removed my header a couple months ago until I had the parts to do the exhaust properly, I just reinstalled my OBX header a week ago after getting all the parts needed. I had an exhaust shop install the 2 1/4" Magnaflow highflow cat purchased from eBay and a direct fit muffler I purchased from Amazon. The muffler I got is a Walker Quiet Flow SS #53396, according to their website these mufflers have superior flow to stock, after receiving it in the mail I had my doubts. The inlet pipe is about 2" like the stock muffler but the outlet was about 1 1/2", it was a pea-shooter! Installing this muffler made the exhaust quiet while running the header, but power was significantly reduced.
IMAG0169 by troy_jr_2000, on Flickr
IMAG0170 by troy_jr_2000, on Flickr
IMAG0100 by troy_jr_2000, on Flickr
I had purchased a muffler from a member here a month or so ago, a Vibrant flat black oval. Some videos of hondas running this muffler sounded good, others were pretty loud, today I was going to find out how it sounds in an Elantra. Since I no longer work in a shop that lets me work on my crap I had to drag my welder to a friends house, I didn't want to pay $50 to install a muffler I may not like. To make a long story short, it sounded like A$$. http://youtu.be/W2dSiu6knSs
This left me with a delimma, put the restrictive muffler back in or the stock muffler that sounded just as bad but in a different way. Then I wondered, what if I modified the quiet muffler to flow better? Am I gonna have another loud muffler after doing this? Only one way to find out!
IMAG0202 by troy_jr_2000, on Flickr
IMAG0215 by troy_jr_2000, on Flickr
IMAG0206 by troy_jr_2000, on Flickr
IMAG0207 by troy_jr_2000, on Flickr
IMAG0210 by troy_jr_2000, on Flickr
IMAG0216 by troy_jr_2000, on Flickr
IMAG0217 by troy_jr_2000, on Flickr
IMAG0219 by troy_jr_2000, on Flickr
IMAG0220 by troy_jr_2000, on Flickr
Whats not shown in the pictures is I also drilled 6 - 3/8" holes in the sides of the new tailpipe thats stuck in the muffler case. This was to allow some flow from the other chamber out the tail pipe without needing to complete the trip through all the chambers. The inner part of the muffler that the new, larger 2" tailpipe was butting against was about 1 3/4", so this would still restrict flow if the exhaust didn't have another path out.
Mission accomplished! I achieved my goal, I got my power back and the muffler is still pretty quiet. It's hardly noticible until I put my foot into it, then it gets loud.. doesn't sound bad at all. I will make a video tomorrow. I've got some other plans for tomorrow, too! Installing a cold air intake and piggyback tuner, should be fun!